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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
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<blockquote data-quote="RMB_Ryan" data-source="post: 1338960" data-attributes="member: 32281"><p>Hey Chris. Glad you have the engine running well. Once through break-in (IE break-in procedure is complete and you have a chance to get a tune dialed in) any skirt noise you hear from the pistons should disappear. We use a FSR forging or forged side relief piston which has a smaller skirt and load on the major thrust faces of the cylinder walls. This combined with a .030" pin offset pretty much eliminates piston slap, but I will be really curious if you still have any noticeable cold start piston noise once you have say 5000 miles on it and it is dialed in. Many times we also find that there is a bit of a cold start shutter do everything relearning, plugs should usually be gapped a tick tighter than normal. </p><p></p><p>If you need anything you know how to get a hold of me, but nice work. Talk soon brother.</p></blockquote><p></p>
[QUOTE="RMB_Ryan, post: 1338960, member: 32281"] Hey Chris. Glad you have the engine running well. Once through break-in (IE break-in procedure is complete and you have a chance to get a tune dialed in) any skirt noise you hear from the pistons should disappear. We use a FSR forging or forged side relief piston which has a smaller skirt and load on the major thrust faces of the cylinder walls. This combined with a .030" pin offset pretty much eliminates piston slap, but I will be really curious if you still have any noticeable cold start piston noise once you have say 5000 miles on it and it is dialed in. Many times we also find that there is a bit of a cold start shutter do everything relearning, plugs should usually be gapped a tick tighter than normal. If you need anything you know how to get a hold of me, but nice work. Talk soon brother. [/QUOTE]
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